<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>flex</title>
    <style>
        .content{
            width: 300px;
            height: 500px;
            background-color: aqua;
            display: flex;
            flex-direction: row;
            justify-content: center;
            align-items:self-start;

        }
        .box{
            width: 80px;

            margin: 2px;
            background-color: red;
        }
        /*  .box1{
              order:12;
              flex-grow:1;
              align-self: flex-start;
          }
          .box2{
              order:1;
          }
          .box3{
              order:8;
          }*/

    </style>
</head>
<body>
<div class="content">
    <div class="box box1">1</div>
    <div class="box box2">2</div>
    <div class="box box3">3</div>
</div>
</body>
</html>